<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      class Person {
        constructor(a, b, z) {
          console.log(a + b + z);
        }
      }
      class User extends Person {
        constructor(x, y) {
          super(x, y, 200);
        }
      }
      new User(100, 200);

      // const u = new User();
    </script>
  </body>
</html>
